2 * k8temp.c - Linux kernel module for hardware monitoring
4 * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
6 * Inspired from the w83785 and amd756 drivers.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 #include <linux/module.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/pci.h>
30 #include <linux/hwmon.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34 #include <asm/processor.h>
36 #define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
38 #define SEL_PLACE 0x40
42 struct device
*hwmon_dev
;
43 struct mutex update_lock
;
45 char valid
; /* zero until following fields are valid */
46 unsigned long last_updated
; /* in jiffies */
48 /* registers values */
49 u8 sensorsp
; /* sensor presence bits - SEL_CORE & SEL_PLACE */
50 u32 temp
[2][2]; /* core, place */
53 static struct k8temp_data
*k8temp_update_device(struct device
*dev
)
55 struct k8temp_data
*data
= dev_get_drvdata(dev
);
56 struct pci_dev
*pdev
= to_pci_dev(dev
);
59 mutex_lock(&data
->update_lock
);
62 || time_after(jiffies
, data
->last_updated
+ HZ
)) {
63 pci_read_config_byte(pdev
, REG_TEMP
, &tmp
);
64 tmp
&= ~(SEL_PLACE
| SEL_CORE
); /* Select sensor 0, core0 */
65 pci_write_config_byte(pdev
, REG_TEMP
, tmp
);
66 pci_read_config_dword(pdev
, REG_TEMP
, &data
->temp
[0][0]);
68 if (data
->sensorsp
& SEL_PLACE
) {
69 tmp
|= SEL_PLACE
; /* Select sensor 1, core0 */
70 pci_write_config_byte(pdev
, REG_TEMP
, tmp
);
71 pci_read_config_dword(pdev
, REG_TEMP
,
75 if (data
->sensorsp
& SEL_CORE
) {
76 tmp
&= ~SEL_PLACE
; /* Select sensor 0, core1 */
78 pci_write_config_byte(pdev
, REG_TEMP
, tmp
);
79 pci_read_config_dword(pdev
, REG_TEMP
,
82 if (data
->sensorsp
& SEL_PLACE
) {
83 tmp
|= SEL_PLACE
; /* Select sensor 1, core1 */
84 pci_write_config_byte(pdev
, REG_TEMP
, tmp
);
85 pci_read_config_dword(pdev
, REG_TEMP
,
90 data
->last_updated
= jiffies
;
94 mutex_unlock(&data
->update_lock
);
102 static ssize_t
show_name(struct device
*dev
, struct device_attribute
105 struct k8temp_data
*data
= dev_get_drvdata(dev
);
107 return sprintf(buf
, "%s\n", data
->name
);
111 static ssize_t
show_temp(struct device
*dev
,
112 struct device_attribute
*devattr
, char *buf
)
114 struct sensor_device_attribute_2
*attr
=
115 to_sensor_dev_attr_2(devattr
);
117 int place
= attr
->index
;
118 struct k8temp_data
*data
= k8temp_update_device(dev
);
120 return sprintf(buf
, "%d\n",
121 TEMP_FROM_REG(data
->temp
[core
][place
]));
126 static SENSOR_DEVICE_ATTR_2(temp1_input
, S_IRUGO
, show_temp
, NULL
, 0, 0);
127 static SENSOR_DEVICE_ATTR_2(temp2_input
, S_IRUGO
, show_temp
, NULL
, 0, 1);
128 static SENSOR_DEVICE_ATTR_2(temp3_input
, S_IRUGO
, show_temp
, NULL
, 1, 0);
129 static SENSOR_DEVICE_ATTR_2(temp4_input
, S_IRUGO
, show_temp
, NULL
, 1, 1);
130 static DEVICE_ATTR(name
, S_IRUGO
, show_name
, NULL
);
132 static struct pci_device_id k8temp_ids
[] = {
133 { PCI_DEVICE(PCI_VENDOR_ID_AMD
, PCI_DEVICE_ID_AMD_K8_NB_MISC
) },
137 MODULE_DEVICE_TABLE(pci
, k8temp_ids
);
139 static int __devinit
k8temp_probe(struct pci_dev
*pdev
,
140 const struct pci_device_id
*id
)
146 struct k8temp_data
*data
;
148 if (!(data
= kzalloc(sizeof(struct k8temp_data
), GFP_KERNEL
))) {
153 model
= boot_cpu_data
.x86_model
;
154 stepping
= boot_cpu_data
.x86_mask
;
156 switch (boot_cpu_data
.x86
) {
158 /* feature available since SH-C0, exclude older revisions */
159 if (((model
== 4) && (stepping
== 0)) ||
160 ((model
== 5) && (stepping
<= 1))) {
166 dev_warn(&pdev
->dev
, "Temperature readouts might be "
167 "wrong - check erratum #141\n");
173 pci_read_config_byte(pdev
, REG_TEMP
, &scfg
);
174 scfg
&= ~(SEL_PLACE
| SEL_CORE
); /* Select sensor 0, core0 */
175 pci_write_config_byte(pdev
, REG_TEMP
, scfg
);
176 pci_read_config_byte(pdev
, REG_TEMP
, &scfg
);
178 if (scfg
& (SEL_PLACE
| SEL_CORE
)) {
179 dev_err(&pdev
->dev
, "Configuration bit(s) stuck at 1!\n");
184 scfg
|= (SEL_PLACE
| SEL_CORE
);
185 pci_write_config_byte(pdev
, REG_TEMP
, scfg
);
187 /* now we know if we can change core and/or sensor */
188 pci_read_config_byte(pdev
, REG_TEMP
, &data
->sensorsp
);
190 if (data
->sensorsp
& SEL_PLACE
) {
191 scfg
&= ~SEL_CORE
; /* Select sensor 1, core0 */
192 pci_write_config_byte(pdev
, REG_TEMP
, scfg
);
193 pci_read_config_dword(pdev
, REG_TEMP
, &temp
);
194 scfg
|= SEL_CORE
; /* prepare for next selection */
195 if (!((temp
>> 16) & 0xff)) /* if temp is 0 -49C is not likely */
196 data
->sensorsp
&= ~SEL_PLACE
;
199 if (data
->sensorsp
& SEL_CORE
) {
200 scfg
&= ~SEL_PLACE
; /* Select sensor 0, core1 */
201 pci_write_config_byte(pdev
, REG_TEMP
, scfg
);
202 pci_read_config_dword(pdev
, REG_TEMP
, &temp
);
203 if (!((temp
>> 16) & 0xff)) /* if temp is 0 -49C is not likely */
204 data
->sensorsp
&= ~SEL_CORE
;
207 data
->name
= "k8temp";
208 mutex_init(&data
->update_lock
);
209 dev_set_drvdata(&pdev
->dev
, data
);
211 /* Register sysfs hooks */
212 err
= device_create_file(&pdev
->dev
,
213 &sensor_dev_attr_temp1_input
.dev_attr
);
217 /* sensor can be changed and reports something */
218 if (data
->sensorsp
& SEL_PLACE
) {
219 err
= device_create_file(&pdev
->dev
,
220 &sensor_dev_attr_temp2_input
.dev_attr
);
225 /* core can be changed and reports something */
226 if (data
->sensorsp
& SEL_CORE
) {
227 err
= device_create_file(&pdev
->dev
,
228 &sensor_dev_attr_temp3_input
.dev_attr
);
231 if (data
->sensorsp
& SEL_PLACE
)
232 err
= device_create_file(&pdev
->dev
,
233 &sensor_dev_attr_temp4_input
.
239 err
= device_create_file(&pdev
->dev
, &dev_attr_name
);
243 data
->hwmon_dev
= hwmon_device_register(&pdev
->dev
);
245 if (IS_ERR(data
->hwmon_dev
)) {
246 err
= PTR_ERR(data
->hwmon_dev
);
253 device_remove_file(&pdev
->dev
,
254 &sensor_dev_attr_temp1_input
.dev_attr
);
255 device_remove_file(&pdev
->dev
,
256 &sensor_dev_attr_temp2_input
.dev_attr
);
257 device_remove_file(&pdev
->dev
,
258 &sensor_dev_attr_temp3_input
.dev_attr
);
259 device_remove_file(&pdev
->dev
,
260 &sensor_dev_attr_temp4_input
.dev_attr
);
261 device_remove_file(&pdev
->dev
, &dev_attr_name
);
263 dev_set_drvdata(&pdev
->dev
, NULL
);
269 static void __devexit
k8temp_remove(struct pci_dev
*pdev
)
271 struct k8temp_data
*data
= dev_get_drvdata(&pdev
->dev
);
273 hwmon_device_unregister(data
->hwmon_dev
);
274 device_remove_file(&pdev
->dev
,
275 &sensor_dev_attr_temp1_input
.dev_attr
);
276 device_remove_file(&pdev
->dev
,
277 &sensor_dev_attr_temp2_input
.dev_attr
);
278 device_remove_file(&pdev
->dev
,
279 &sensor_dev_attr_temp3_input
.dev_attr
);
280 device_remove_file(&pdev
->dev
,
281 &sensor_dev_attr_temp4_input
.dev_attr
);
282 device_remove_file(&pdev
->dev
, &dev_attr_name
);
283 dev_set_drvdata(&pdev
->dev
, NULL
);
287 static struct pci_driver k8temp_driver
= {
289 .id_table
= k8temp_ids
,
290 .probe
= k8temp_probe
,
291 .remove
= __devexit_p(k8temp_remove
),
294 static int __init
k8temp_init(void)
296 return pci_register_driver(&k8temp_driver
);
299 static void __exit
k8temp_exit(void)
301 pci_unregister_driver(&k8temp_driver
);
304 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
305 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
306 MODULE_LICENSE("GPL");
308 module_init(k8temp_init
)
309 module_exit(k8temp_exit
)